1. University of Massachusetts Medical School, Worcester
2. Department of Pediatrics, Children’s Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada
3. Department of Emergency Medicine, Children’s Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada
4. Department of Psychology, Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
5. Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
6. Sports Medicine and Performance Center, Center for Injury Research and Prevention, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
7. Division of Orthopaedics, Perelman School of Medicine, University of Pennsylvania, Philadelphia
8. Sport Injury Prevention Research Centre, Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
9. Faculty of Kinesiology, Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
10. Department of Pediatrics, Division of Critical Care Medicine, Children’s National Hospital, Washington, District of Columbia
11. Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania
12. Division of Emergency Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts